The "Finished 2" label will appear in the Adhoc report as this field label is taken from the "2017 Goal Plan (Bonus)" plan because it has the lowest template ID (4) of all the active Goal Plans that share the same field definition ID (done).

Cause

The instance contains more than 1 Goal plan that shares the same field definition ID with the different field label:

Resolution

It is best practice to avoid the creation of Goal plans with identical field definition IDS that have a different field label defined.